Lash fails to emerge for me with an error regarding texi2html. I got it to emerge by temporarily deleting texi2html.
This is on a general purpose box, just trying to get it to emerge before playing with seed kernels et al. Any pointers would be appreciated.

Hi, wol. I created a patch to fix texi2html related failure, in proaudio overlay. Please sync the overlay and try lash. It should be working now._________________Anyway it's all the same at the end...
Need help to get it working: "x-fi surround 5.1"

!!! Multiple package instances within a single package slot have been pulled
!!! into the dependency graph, resulting in a slot conflict:

dev-games/ogre:0

(dev-games/ogre-1.7.4-r1::gentoo, ebuild scheduled for merge) pulled in by
>=dev-games/ogre-1.7 required by (dev-games/cegui-0.7.6-r1::gentoo, ebuild scheduled for merge)

(dev-games/ogre-1.6.5::gentoo, ebuild scheduled for merge) pulled in by
>=dev-games/ogre-1.4.7[cegui,devil] required by (media-sound/psychosynth-0.2.0::proaudio, ebuild scheduled for merge)

It may be possible to solve this problem by using package.mask to
prevent one of those packages from being selected. However, it is also
possible that conflicting dependencies exist such that they are
impossible to satisfy simultaneously. If such a conflict exists in
the dependencies of two different packages, then those packages can
not be installed simultaneously. You may want to try a larger value of
the --backtrack option, such as --backtrack=30, in order to see if
that will solve this conflict automatically.

For more information, see MASKED PACKAGES section in the emerge man
page or refer to the Gentoo Handbook.

Then, I tried emerging again with the --backtrack=30 option, as advised in the above message, and it didn't help.

!!! Multiple package instances within a single package slot have been pulled
!!! into the dependency graph, resulting in a slot conflict:

dev-games/ogre:0

(dev-games/ogre-1.7.4-r1::gentoo, ebuild scheduled for merge) pulled in by
>=dev-games/ogre-1.7 required by (dev-games/cegui-0.7.6-r1::gentoo, ebuild scheduled for merge)

(dev-games/ogre-1.6.5::gentoo, ebuild scheduled for merge) pulled in by
>=dev-games/ogre-1.4.7[cegui,devil] required by (media-sound/psychosynth-0.2.0::proaudio, ebuild scheduled for merge)

It may be possible to solve this problem by using package.mask to
prevent one of those packages from being selected. However, it is also
possible that conflicting dependencies exist such that they are
impossible to satisfy simultaneously. If such a conflict exists in
the dependencies of two different packages, then those packages can
not be installed simultaneously. You may want to try a larger value of
the --backtrack option, such as --backtrack=30, in order to see if
that will solve this conflict automatically.

For more information, see MASKED PACKAGES section in the emerge man
page or refer to the Gentoo Handbook.

Then, I tried emerging again with the --backtrack=30 option, as advised in the above message, and it didn't help.

Calculating dependencies... done!
* EAPI assignment in ebuild 'media-sound/hydrogen-0.9.3-r1::proaudio'
* does not conform with PMS section 7.3.1 (see bug #402167):
* valid EAPI assignment must occur on or before line: 5
* NOTE: This error will soon become unconditionally fatal in a future
* version of Portage, but at this time, it can by made non-fatal by
* setting FEATURES=-parse-eapi-ebuild-head in make.conf.
[ebuild N ] media-sound/hydrogen-0.9.5 USE="alsa archive jack ladspa lash -oss -portaudio"

Would you like to merge these packages? [Yes/No]

Despite the warning, it does build fine, however. But I thought you might want to know about this so that it can be fixed in future ebuilds.

Calculating dependencies... done!
* EAPI assignment in ebuild 'media-sound/hydrogen-0.9.3-r1::proaudio'
* does not conform with PMS section 7.3.1 (see bug #402167):
* valid EAPI assignment must occur on or before line: 5
* NOTE: This error will soon become unconditionally fatal in a future
* version of Portage, but at this time, it can by made non-fatal by
* setting FEATURES=-parse-eapi-ebuild-head in make.conf.
[ebuild N ] media-sound/hydrogen-0.9.5 USE="alsa archive jack ladspa lash -oss -portaudio"

Would you like to merge these packages? [Yes/No]

Despite the warning, it does build fine, however. But I thought you might want to know about this so that it can be fixed in future ebuilds.

So that says that I need cegui version 0.5.0b-r3 or greater, while the error message we were discussing earlier was complaining that cegui version 0.6.3 or greater was blocking ogre 1.6.5.

I just noticed that the following versions of cegui are available in portage: 0.6.2b 0.7.5-r1 0.7.6-r1 ~0.7.7

I guess that because cegui 0.7.6-r1 was the highest numbered available version in portage, portage chose it to emerge when emerging psychosynth. However, cegui 0.6.2b would fit the 0.5.0b-r3 or greater requirement, and yet would be smaller than 0.6.3 and therefore not block ogre 1.6.5

So, I manually emerge cegui 0.6.2b, and tried emerging psychosynth. This time it started emerging without complaint.

I don't know why portage couldn't have automatically tried resolve the block by trying to emerge cegui 0.6.2b itself. Oh well, as long as the manual process works..

Museseq's ebuild is out of date. Muse is up to 2.0.1 (stable) and the ebuild has to be re-written, because I was able to manually compile it, but was not able to simply copy the 1.0.1 ebuild to 2.0.1. Also, the 2.9999 ebuild isn't able to fetch - at least, it wasn't when I tried it. Either way, it's better to include an ebuild for the latest stable release.

>>> Configuring source in /var/tmp/portage/media-sound/jack-audio-connection-kit-1.9.8/work/jack-1.9.8/jack-1.9.8 ...
* Running "./waf configure --prefix=/usr --destdir=/var/tmp/portage/media-sound/jack-audio-connection-kit-1.9.8/image/ --alsa --dbus" ...
Linux detected
Checking for program g++ : ok /usr/bin/g++
Checking for compiler version : ok 4.5.3
Checking for program cpp : ok /usr/bin/cpp
Checking for program ar : ok /usr/bin/ar
Checking for program ranlib : ok /usr/bin/ranlib
Checking for g++ : ok
Checking for program gcc : ok /usr/bin/gcc
Checking for compiler version : ok 4.5.3
Checking for program ar : ok /usr/bin/ar
Checking for program ranlib : ok /usr/bin/ranlib
Checking for gcc : ok
Checking for header samplerate.h : ok
Checking for alsa >= 1.0.18 : ok
Checking for libfreebob >= 1.0.0 : Package "libfreebob (>= 1.0.0)" could not be found or the found version is too old.
Checking for libffado >= 1.999.17 : Package "libffado (>= 1.999.17)" could not be found or the found version is too old.
Checking for dbus-1 >= 1.0.0 : ok
Checking for dbus-1 flags : ok
Checking for header expat.h : ok
Checking for header samplerate.h : ok
Checking for header sndfile.h : ok
Checking for celt >= 0.5.0 : Package "celt (>= 0.5.0)" could not be found or the found version is too old.
Checking for header ncurses.h : ok
Checking for library readline : ok
Checking for celt >= 0.11.0 : Package "celt (>= 0.11.0)" could not be found or the found version is too old.
Checking for celt >= 0.8.0 : Package "celt (>= 0.8.0)" could not be found or the found version is too old.
Checking for celt >= 0.7.0 : Package "celt (>= 0.7.0)" could not be found or the found version is too old.
Checking for celt >= 0.5.0 : Package "celt (>= 0.5.0)" could not be found or the found version is too old.